. Railroad structures and estimates . Style oftruss. Heightof truss. No. ofpanels. Total dead and liveload per ft. ofspan. Timber, Wrought Cast imate cost erected. ft. B. M. iron. iron. Ft. Ft. Lbs. Lbs. 30 Pony 9 4 6000 10,200 2,200 1,000 $550 40 Pony 11 4 5500 13,400 3,000 1,300 740 50 Pony 11 6 5200 19,100 5,700 2,900 1170 60 Pony 12 6 4900 22,800 6,800 3,700 1410 70 Pony 13 7 4800 30,000 17,500 8,300 2480 80 Pony 14 8 4800 35,400 22,000 10,000 3010 90 Pony 15 9 4800 42,800 28,700 12,600 3890 90 Through 25 8 4800 41,900 33,100 13,300 4020 100 Through 25 9 4800 48,900 41,600 14,300 4810 110
. Railroad structures and estimates . Style oftruss. Heightof truss. No. ofpanels. Total dead and liveload per ft. ofspan. Timber, Wrought Cast imate cost erected. ft. B. M. iron. iron. Ft. Ft. Lbs. Lbs. 30 Pony 9 4 6000 10,200 2,200 1,000 $550 40 Pony 11 4 5500 13,400 3,000 1,300 740 50 Pony 11 6 5200 19,100 5,700 2,900 1170 60 Pony 12 6 4900 22,800 6,800 3,700 1410 70 Pony 13 7 4800 30,000 17,500 8,300 2480 80 Pony 14 8 4800 35,400 22,000 10,000 3010 90 Pony 15 9 4800 42,800 28,700 12,600 3890 90 Through 25 8 4800 41,900 33,100 13,300 4020 100 Through 25 9 4800 48,900 41,600 14,300 4810 110 Through 25 10 4800 54,800 48,200 16,000 5290 120 Through 25 11 4800 62,100 56,900 18,300 6350 130 Through 25 12 4700 70,200 67,300 20,900 7320 140 Through 25 13 4700 78,200 73,900 23,300 8100 150 Through 25 14 4700 86,700 87,300 27,100 9330 Prices assumed: Timber, $35 per M. ft. B. M. erected; steel, 5 cts. per pound erected; castiron, 4 cts. per pound erected. Supervision and contingencies, 10%. 6-2% X 12 Spruce Lattice Plank 12 x 3. 6-3%s 12Hard Pine and 2-27-^x 12SpruceHALF INSIDE ELEVATION OF TRUSS BOTTOM BRACING-1-3-3^^^ >H ^l-3-3^^ H< ^1-3-3-!^ ^Jll:l.^^
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Keywords: ., bookauthororrockjohnwilson1870, bookcentury1900, bookdecade1910
